22 Mar
2016
22 Mar
'16
7:19 p.m.
My advice with Server 2008R2 and later is to leave SMB, oplocks, leasing and caching alone unless you're forced to mess with them.
--
Alan Bourke
alanpbourke (at) fastmail (dot) fm
On Tue, 22 Mar 2016, at 10:01 AM, Peter Cushing wrote:
> On 21/03/2016 18:45, Tracy Pearson wrote:
> > We host our data on a Server 2012 with application being run from
> > Server 2008 accessing the data. We get CDX corruption. Some clients
> > more than others. We have a nightly routine to index troubled clients
> > data sets. Since you asked this. I'm starting some research to see
> > which files get corrupt the most. There might be a pattern to our
> > corruption, and a pattern to the code that touches the files.
> Thanks for the responses.
>
> From what I've been reading the problems with SMB were version 1 and
> early version 2, although there is a lot of conflicting advice out
> there, even on mircosoft sites. As far as I can see later versions
> should be ok on the opportunistic locking/caching front. Found a few
> people who recommended turning off server leasing:
>
> https://social.technet.microsoft.com/Forums/windowsserver/en-US/7336d31b-6c2...
>
>
> A couple of suggestions from the site:
>
> The solution here is to leave SMB2/3 enabled but disable leasing.
> Leasing is just an enhanced form of OpLocks.
>
> Here is the registry entry that needs to be added to disable server
> leasing for SMB2.1. You will need to reboot after setting this entry.
>
> Key:
> HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\lanmanserver\parameters
> Value: DisableLeasing
> Type: DWORD
> Data: 0x1
>
> ---------------------------------------------------------
>
> We migrated from a Windows 2008 file server cluster with four nodes to a
> Windows 2012 R2 file cluster with two nodes. After the migration to the
> new file server cluster our customers running Windows 7 SP1 started
> reporting Access Database corruption and slow file access. However, if
> the SAME Access Database file was hosted on a Windows 2012 R2 file
> server NOT in a cluster there was no corruption. I will not bore you
> with all the tests we ran while trying to determine the cause but here
> is what we did to fix the issue. The solution was provided via an open
> case with Microsoft.
>
> 1. Create the following registry entries on all Windows 2012 R2 Servers
> in the new file server CLUSTER and reboot.
>
> Key:
> HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\lanmanserver\parameters
>
> Value: DisableLeasing
>
> Type: DWORD
>
> Data: 0x1
>
> We have put this change on and will see how it goes.
>
> Thanks,
>
> Peter
>
>
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[excessive quoting removed by server]